This article describes a viable avenue for improving the nutritional profile of extruded foods by delivering both fiber and antioxidants through incorporation of fruit and vegetable by- products. In the samples tested, extrusion led to a decrease in the concentration of antioxidants(phenolic compounds and carotenoids) in expanded products con- taining apple and tomato pomaces. How- ever, the free-radical scavenging capacity(antioxidant activity) increased due to processing, underscoring the potential health benefits of incorporating these in- gredients. These positive aspects need to be investigated further, including the mechanism of antioxidant activity enhancement. This is part of ongoing investigations by our resreach group.